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A researcher wishes to see if the variance of the areas in square miles for counties in Indiana is less than the variance of the areas for counties in Iowa. A random sample of counties is selected, and the data are shown. At a = 0.01, can it be concluded that the variance of the areas for counties in Indiana is less than the variance of the areas for counties in Iowa?
Give an example of a null and alternative hypotheses. This can be a personal item or something at work. Additionally, identify the Type I and Type II Errors that could occur with your decision-making process.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Choose a variable and collect data for a least three different groups(samples). Compare the means of the three groups using the one-way ANOVA technique. Complete the following:
At the .025 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes?
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
A telemarketing company wants to find out if people are more likely to answer the phone between 8pm and 9pm than between 7pm and 8pm.
Determine the probability that between 5 and 10 minutes will pass between successive occurrences.
Write a sample result section, discussing your data screening activity (this section should be in APA format).
The NY Dept of Motor Vehicles (DMV) designs its license plates with space for 7 letters or numerals. In the most recent iteration, the DMV uses three letters followed by 4 numbers.
Both days have sample standard deviations of 3.4. Is the average mean of size different from day 1 to day 2?
Use the given margin of error, confidence level, and population standard deviation (o) to find the minimum sample size required to estimate an unknown population means (u)
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